The poll revealed that 39 percent of likely American voters "strongly disapprove" of the way Trump is performing, while 35 percent "strongly approve" of the job he is doing.
The decline came amid rising controversy over the president's naming of a former lawmaker of the ruling Democratic Party to the head of the Financial Supervisory Service (FSS). Historically, the approval ratings of American presidents have risen following military action that produces a "rally around the flag" effect.
Trump's approval rating stands at 40 percent in a new Washington Post-ABC News poll, slightly more than his 36 percent approval rating when last measured in January.
One poll showed the president's approval rating fell by four points.
Rasmussen's daily presidential tracking poll had Trump's approval rating at 50 percent on Friday, with 49 percent of respondents disapproving of his job performance. The office of Trump's personal lawyer Michael Cohen was raided by the Federal Bureau of Investigation, who obtained records related to Stormy Daniels that includes relevant payments, the alleged Russian involvement in the 2016 USA presidential election, and more.
And the poll, which was conducted from April 8-11, also showed the Democrats enjoying a 7-point advantage over the Republicans heading into the 2018 midterm elections.
The president has also become increasingly vocal about his frustration with the ongoing investigation into Russia's alleged attempt to interfere in the 2016 presidential election.